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is a significant concern for physicians. Central+ O7 t& L* _. i. D% k/ Y- Y: @
precocious puberty (CPP), which is mediated1 ~+ E& |# k5 M% g& e7 F. f6 f
through the hypothalamic pituitary gonadal axis, has
! [2 W0 t9 B- L) ka higher incidence of organic central nervous system5 W* H& h9 R, C5 p1 r" f
lesions in boys.1,2 Virilization in boys, as manifested, S. Z# M0 w$ t: {, ?1 k' o
by enlargement of the penis, development of pubic
7 q. ~1 b, D8 vhair, and facial acne without enlargement of testi-
6 e0 D# a6 s" Ocles, suggests peripheral or pseudopuberty.1-3 We+ X" ?* v1 W' J% m
report a 16-month-old boy who presented with the' q0 Y' k' @4 U# c
enlargement of the phallus and pubic hair develop-
8 |9 u& y V4 r' l6 w5 I; W5 kment without testicular enlargement, which was due( k5 P9 d) {$ T5 Y
to the unintentional exposure to androgen gel used by) ~6 n3 n. o$ F' H' `+ n
the father. The family initially concealed this infor-3 _ F6 V3 M3 L( P
mation, resulting in an extensive work-up for this
* t3 S1 ?" U6 K6 b) s. G3 schild. Given the widespread and easy availability of4 j0 j, v8 u7 W7 F. E* P6 u, v
testosterone gel and cream, we believe this is proba-- C1 H1 r& I: r! v5 E
bly more common than the rare case report in the
1 Y6 L' d- b5 Z$ c" f4 u: nliterature.4
1 C6 F' U* _* zPatient Report& e4 e# U% p% v
A 16-month-old white child was referred to the
+ E: u" G* `+ W! f& i( L- zendocrine clinic by his pediatrician with the concern
$ l9 w0 W* A( U; Pof early sexual development. His mother noticed4 T" c$ |( L0 e) _" h) g) S
light colored pubic hair development when he was5 N# ?( a; l) Q6 E1 m0 d
From the 1Division of Pediatric Endocrinology, 2University of0 ~ R3 P+ ?1 w u7 i* I
South Alabama Medical Center, Mobile, Alabama.3 w- P/ j4 F9 z& J' b3 w7 Y+ k
Address correspondence to: Samar K. Bhowmick, MD, FACE,1 F& `4 E4 E' x, R% a
Professor of Pediatrics, University of South Alabama, College of
- G; f2 |$ R5 cMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
% X, C. u% I0 e$ he-mail: [email protected].
# h7 U8 A$ ^' @7 W6 M# ] k4 `about 6 to 7 months old, which progressively became/ c% h) S! x8 Z9 t/ W
darker. She was also concerned about the enlarge-
5 o0 u# G' z: s0 E; ument of his penis and frequent erections. The child9 Q# b5 r; p4 C) r
was the product of a full-term normal delivery, with& j2 H8 e+ f% {' N( l
a birth weight of 7 lb 14 oz, and birth length of2 O4 v3 i8 I- ]0 J2 @1 |
20 inches. He was breast-fed throughout the first year
2 u4 X) k3 |% T+ K, g/ N& Hof life and was still receiving breast milk along with
8 S2 r: d" c1 Z/ z, asolid food. He had no hospitalizations or surgery,
/ ] ~. t7 P Zand his psychosocial and psychomotor development4 ?0 e. |/ x% l9 a: j' W# y
was age appropriate.4 H; h: g0 |) C: c% {( s G
The family history was remarkable for the father,
) I9 h& D( K9 P1 M1 g9 Bwho was diagnosed with hypothyroidism at age 16,) j- y- d0 U4 P2 {8 d `
which was treated with thyroxine. The father’s! d; ~; D# [ K8 N
height was 6 feet, and he went through a somewhat+ R: a' K8 h1 ~6 ~# w8 n1 k2 o
early puberty and had stopped growing by age 14.
7 g2 e8 o' W4 QThe father denied taking any other medication. The
6 G0 G( l$ R, \9 U, F# L' Y7 fchild’s mother was in good health. Her menarche9 X8 l, n" x0 c) \- G b( F8 D
was at 11 years of age, and her height was at 5 feet
% ?! K, |! R3 |, J; V/ B& X" b5 inches. There was no other family history of pre-% i: X& [4 P/ |# |5 d
cocious sexual development in the first-degree rela-* _. k! {) C5 j' A; O9 [% F% z7 b
tives. There were no siblings.4 `6 O7 J; C" ]' |
Physical Examination
1 l# @8 } ]) h6 v X: fThe physical examination revealed a very active,
6 `9 A/ }0 A# a% D; a8 fplayful, and healthy boy. The vital signs documented
& L3 |% B' T2 Z5 fa blood pressure of 85/50 mm Hg, his length was4 a0 }2 b' l/ I9 B9 D
90 cm (>97th percentile), and his weight was 14.4 kg
5 f' t+ L2 ?- O# F) _9 {(also >97th percentile). The observed yearly growth8 z; u* M$ t0 ^$ W( R' s
velocity was 30 cm (12 inches). The examination of
2 n! f* \' c# N8 qthe neck revealed no thyroid enlargement.
; r1 _1 U! X& W1 ^( v: O; h) J6 R$ AThe genitourinary examination was remarkable for
7 m. ]. q$ q' c+ [% Venlargement of the penis, with a stretched length of4 d5 I1 C0 }- Q7 g! F, [+ e. z
8 cm and a width of 2 cm. The glans penis was very well
7 N% j) p9 v- C% y1 y9 U+ }! ndeveloped. The pubic hair was Tanner II, mostly around
6 L) D6 u6 E- r540( E; E2 R5 w v
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
0 K, m0 |& v7 a: l" hthe base of the phallus and was dark and curled. The1 ~: u- s/ J. v9 d0 R
testicular volume was prepubertal at 2 mL each.
! z+ h/ E3 o. a9 q# d/ LThe skin was moist and smooth and somewhat
4 y7 J% z: m5 t" I- Aoily. No axillary hair was noted. There were no, ]9 p" L& M, J5 G' e7 Z0 }. _
abnormal skin pigmentations or café-au-lait spots.9 Q9 G. h: L$ w5 Z, e
Neurologic evaluation showed deep tendon reflex 2+- V0 P' Q x8 W' y! z
bilateral and symmetrical. There was no suggestion1 h6 x4 x: M+ U/ z
of papilledema.% Q- P/ [# w& Z* _& N- s) K
Laboratory Evaluation
5 x7 G2 n7 |1 D" ?8 U2 ?" R, k' wThe bone age was consistent with 28 months by( z9 S) S* h" L( ]' q7 S1 `. d! z1 r
using the standard of Greulich and Pyle at a chrono-
/ ]9 [5 c' s+ z$ Dlogic age of 16 months (advanced).5 Chromosomal
5 v. w4 A# c7 S% Mkaryotype was 46XY. The thyroid function test
$ z) g3 ?, q, w& X! ~* qshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
+ t( q3 R( } i. \! j1 p- zlating hormone level was 1.3 µIU/mL (both normal).
, {% z1 ]2 w7 ]9 O: EThe concentrations of serum electrolytes, blood
- V* ~3 Z8 r3 n* Z" O; Purea nitrogen, creatinine, and calcium all were
( h3 }+ @4 n6 Pwithin normal range for his age. The concentration; o: q# o. X; L; x" \, ~
of serum 17-hydroxyprogesterone was 16 ng/dL5 m7 ^: }- c! }, K0 d1 @, x
(normal, 3 to 90 ng/dL), androstenedione was 20" y9 _9 B, q/ e, P
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
7 H3 e# Z4 b+ c+ `terone was 38 ng/dL (normal, 50 to 760 ng/dL),7 z1 z4 V( @' s7 @0 R
desoxycorticosterone was 4.3 ng/dL (normal, 7 to0 d" j1 ?7 H" R$ ~9 m
49ng/dL), 11-desoxycortisol (specific compound S)
5 v; \$ r; m: |was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
2 Q! G# q6 ~9 u1 r! e7 Htisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total6 V. h) L$ n1 C s, _4 q
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
. l+ K ?- L5 f. d& h- nand β-human chorionic gonadotropin was less than
/ `) f6 m/ C2 i5 `5 mIU/mL (normal <5 mIU/mL). Serum follicular/ B, G4 T& q( K3 n
stimulating hormone and leuteinizing hormone
2 y8 @! a0 @& W) x( q+ X9 hconcentrations were less than 0.05 mIU/mL7 F4 z6 F' m2 a
(prepubertal).
4 j2 y- S/ t- V# z0 `& DThe parents were notified about the laboratory
6 O7 J! O0 F, y% {' s4 Presults and were informed that all of the tests were
, i4 U" _: N$ S2 L0 q0 c) v2 Snormal except the testosterone level was high. The
, j) e- t0 V) ~2 Pfollow-up visit was arranged within a few weeks to
+ j% d0 Z% |9 `/ Zobtain testicular and abdominal sonograms; how-" u2 w/ h8 Y; R: Z& v$ z
ever, the family did not return for 4 months.
4 L( e& `/ A3 ]Physical examination at this time revealed that the L ~' ^$ _7 u( \$ ~% f- Q, {- j. g0 P
child had grown 2.5 cm in 4 months and had gained4 ~3 w8 n2 H3 S0 G7 m
2 kg of weight. Physical examination remained; [# a8 R! P9 ~ A) i2 A
unchanged. Surprisingly, the pubic hair almost com-0 K5 o+ v- m- W0 h: X* U7 P
pletely disappeared except for a few vellous hairs at) l1 K" N1 w0 }4 v0 z; L/ I6 l
the base of the phallus. Testicular volume was still 27 u) n0 N) p2 f! U
mL, and the size of the penis remained unchanged.) N% @# R9 i1 \' I
The mother also said that the boy was no longer hav-5 W. m3 r' y [
ing frequent erections.( r9 z1 |- }* T( F
Both parents were again questioned about use of* |2 _% h$ U0 ~- q
any ointment/creams that they may have applied to
0 J* R0 q% P2 Q* x2 ]the child’s skin. This time the father admitted the
# r0 w. v9 {( w! nTopical Testosterone Exposure / Bhowmick et al 541& h$ `/ P$ j! V N& O
use of testosterone gel twice daily that he was apply-! p5 {. q4 W8 r) K2 H
ing over his own shoulders, chest, and back area for
$ r G8 s% R& S+ |0 S) O7 n4 xa year. The father also revealed he was embarrassed
5 v. h1 z8 p+ q6 s: hto disclose that he was using a testosterone gel pre-: _/ E% y0 ^/ @" v/ o/ T
scribed by his family physician for decreased libido
+ e6 {# D8 G( Y& }secondary to depression.5 x0 ^; t( o1 r2 A
The child slept in the same bed with parents.
3 j1 d0 Q* v8 |% sThe father would hug the baby and hold him on his
- d# X1 P; p6 U% G2 ychest for a considerable period of time, causing sig-) }7 G2 n* R( J: j+ ~# v: O1 Q
nificant bare skin contact between baby and father.
% Y& ^$ A+ i: V2 n8 t7 x% b( pThe father also admitted that after the phone call,
' }: R$ ^1 g/ Mwhen he learned the testosterone level in the baby7 ]! x; b2 t- x# I
was high, he then read the product information
* L) j$ f) o& l+ a+ [packet and concluded that it was most likely the rea-8 w8 Z0 o( l- R# n% ]- u& q# M
son for the child’s virilization. At that time, they: F& j7 G8 z$ I- A/ [. b
decided to put the baby in a separate bed, and the
7 q0 N- o' K0 s$ I- f$ n- V! cfather was not hugging him with bare skin and had
' I* X3 A% u: ]2 dbeen using protective clothing. A repeat testosterone9 g8 r. {* s' B9 h8 Q1 h: X
test was ordered, but the family did not go to the
" H: q5 w( v2 \2 I8 x, Zlaboratory to obtain the test.
: C5 [* A/ Q0 S# C! a8 MDiscussion7 E1 Y% _& \. M" B U
Precocious puberty in boys is defined as secondary. P7 R0 W' f- O& g
sexual development before 9 years of age.1,4& p o6 F, h0 D g9 o9 w7 M6 r( \) |
Precocious puberty is termed as central (true) when1 \- B" @& D2 ^0 n% c
it is caused by the premature activation of hypo-
/ V* v: n8 b7 P6 ~6 Cthalamic pituitary gonadal axis. CPP is more com-
; ]1 s8 p; ]- x2 m- Z% p, S7 Fmon in girls than in boys.1,3 Most boys with CPP# L' F# {- G$ q# D! w
may have a central nervous system lesion that is" t) `6 |3 g( ~% @7 f
responsible for the early activation of the hypothal-
t' I& w" \+ w) O; p2 ?6 bamic pituitary gonadal axis.1-3 Thus, greater empha-
/ r7 A+ E; Y6 S s& S: N. P. y4 wsis has been given to neuroradiologic imaging in1 i) j6 `. G: S4 u' y: w7 P
boys with precocious puberty. In addition to viril-
8 R: x4 a5 i* C0 W" ~8 H- d4 ~ization, the clinical hallmark of CPP is the symmet-& b% p% e. q$ v
rical testicular growth secondary to stimulation by8 p+ m3 A; E% x/ G' B b/ F! t; t
gonadotropins.1,3
8 e: V" B2 p2 }+ I. `Gonadotropin-independent peripheral preco-
: X) n& e; I; P7 K0 @# A# x8 a0 \* Ycious puberty in boys also results from inappropriate/ \( b5 R0 M( s9 @5 D, s
androgenic stimulation from either endogenous or
! p6 W. P1 S: m1 T/ y+ }exogenous sources, nonpituitary gonadotropin stim- ^, L% `- x( |. V3 b
ulation, and rare activating mutations.3 Virilizing& K1 b4 v- g9 a! e2 h$ Y- u: K
congenital adrenal hyperplasia producing excessive7 w( A/ g! j0 |5 K
adrenal androgens is a common cause of precocious
: e$ s! Y E- W! L/ C4 d/ T. `+ Opuberty in boys.3,40 q) s& g; _2 m
The most common form of congenital adrenal
. ]" I0 ]% E. [hyperplasia is the 21-hydroxylase enzyme deficiency. u, T! y: P7 e, @9 j; h; f( p
The 11-β hydroxylase deficiency may also result in
7 m0 d0 U9 C: d- P' jexcessive adrenal androgen production, and rarely, e6 `, P0 J- z$ C
an adrenal tumor may also cause adrenal androgen
7 D! T; I% a1 y! ^8 uexcess.1,3! ~% G @& J6 ~% T% C4 U7 v6 }' ~
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
( a# W+ I" j9 t) n# }$ F542 Clinical Pediatrics / Vol. 46, No. 6, July 20075 A$ A# I+ [3 j0 b. J
A unique entity of male-limited gonadotropin-6 u# ?- W: q# r% \2 B
independent precocious puberty, which is also known- C% y7 q" p6 F2 |8 ]
as testotoxicosis, may cause precocious puberty at a
# Y7 }8 r G+ ?; y2 Nvery young age. The physical findings in these boys& i# D- v8 @8 p" S
with this disorder are full pubertal development,
& H# l/ f1 K3 Q5 Mincluding bilateral testicular growth, similar to boys3 ~" _; c8 W8 d1 B/ Z5 y
with CPP. The gonadotropin levels in this disorder
. f$ U: }! S5 O; Zare suppressed to prepubertal levels and do not show
9 `! [+ K% q: c3 A9 I* Xpubertal response of gonadotropin after gonadotropin-2 |: X+ w' m$ c8 z
releasing hormone stimulation. This is a sex-linked
& p9 p3 q: ^! G2 M. ^autosomal dominant disorder that affects only
' Y; p) U2 x6 Q* \' y* @0 Nmales; therefore, other male members of the family1 _7 }% n0 b0 M( Q
may have similar precocious puberty.3" F+ y% o/ F0 U4 H: J1 e* z$ W1 ]
In our patient, physical examination was incon-2 B, T* ^; o, k5 B
sistent with true precocious puberty since his testi-+ c7 d- y9 K& G$ T
cles were prepubertal in size. However, testotoxicosis+ b' g2 z& E! m, W' c
was in the differential diagnosis because his father" t1 j$ V# b* Z' _/ [# w
started puberty somewhat early, and occasionally,
0 H4 `+ S" n& q. c& K0 o9 T/ T6 wtesticular enlargement is not that evident in the) }1 K0 j& Z6 R! D2 w# u, ?3 w
beginning of this process.1 In the absence of a neg-
8 x; c) f& O/ J. Cative initial history of androgen exposure, our
" M/ g X L T9 V, K* \& |, Mbiggest concern was virilizing adrenal hyperplasia,
2 }1 @4 [& O0 l( c0 u5 |% Z0 A aeither 21-hydroxylase deficiency or 11-β hydroxylase2 ^* S; }) ]% f$ a
deficiency. Those diagnoses were excluded by find-
! |3 m3 v" p0 w/ _: ~ing the normal level of adrenal steroids.
5 @6 h# J& y* [) A! G3 k2 gThe diagnosis of exogenous androgens was strongly0 }7 z% ]+ b7 } Z7 S
suspected in a follow-up visit after 4 months because1 p" o0 V4 Q4 P M
the physical examination revealed the complete disap-
7 P! P# s4 m Epearance of pubic hair, normal growth velocity, and
2 C8 X! X3 | T! j6 A, Kdecreased erections. The father admitted using a testos-6 {3 ?( r% z2 a Y
terone gel, which he concealed at first visit. He was' z9 z$ m: k+ `
using it rather frequently, twice a day. The Physicians’
$ Z+ a& n9 _% n+ l7 h! Z; ~$ q6 WDesk Reference, or package insert of this product, gel or. ?' d: e1 }( V5 n2 g+ l
cream, cautions about dermal testosterone transfer to) }6 S6 z6 Z" { @6 t
unprotected females through direct skin exposure.& p4 @ P) T4 n n4 @& ?1 u0 F
Serum testosterone level was found to be 2 times the* T* f3 @" S$ x7 Y, l$ |
baseline value in those females who were exposed to: f d' K, U4 g3 i
even 15 minutes of direct skin contact with their male, x5 p9 s4 w# Q/ j/ M0 j) g- w8 O( e: O
partners.6 However, when a shirt covered the applica-
) B. x/ Y) G" ~ ?8 X- Ltion site, this testosterone transfer was prevented.3 |: _- }" w, C; i) K4 z
Our patient’s testosterone level was 60 ng/mL,
7 S; U- u' t, s7 a4 {which was clearly high. Some studies suggest that
% ?' a6 l% \0 l( Xdermal conversion of testosterone to dihydrotestos-( _7 l9 B1 C- s. I( N
terone, which is a more potent metabolite, is more
2 `2 s) f% f* a' r. bactive in young children exposed to testosterone
3 t, q j; A& D2 K. m, y, r) fexogenously7; however, we did not measure a dihy-/ o8 s Y, `- i+ A; a( {# R
drotestosterone level in our patient. In addition to
$ r& e- ~8 M( q! |( y0 lvirilization, exposure to exogenous testosterone in3 C4 X) p t; G: M" H* m
children results in an increase in growth velocity and$ K* ~. x. l! w6 A
advanced bone age, as seen in our patient.5 w' ?) ]0 ^% g8 n0 V
The long-term effect of androgen exposure during- |, x0 L1 e$ H# @$ A
early childhood on pubertal development and final' {+ S( @7 ] a# P8 ~' @
adult height are not fully known and always remain
) t5 z! f; u; ia concern. Children treated with short-term testos-/ q: r& y' i+ l( u
terone injection or topical androgen may exhibit some
9 V* }; \0 ]: R+ Qacceleration of the skeletal maturation; however, after
/ p3 g7 }" P; h! @0 Vcessation of treatment, the rate of bone maturation3 z( R2 l6 l, X/ w4 E. e5 {! ~
decelerates and gradually returns to normal.8,99 p0 O( z. H4 M2 D& F: i
There are conflicting reports and controversy) @" O E8 U7 D+ z
over the effect of early androgen exposure on adult, p) I: d8 }, E1 Y1 C0 \ t% d, a
penile length.10,11 Some reports suggest subnormal! b' I) h+ v2 t6 d
adult penile length, apparently because of downreg-! v2 y' r, O% g( b3 g- B# k
ulation of androgen receptor number.10,12 However,+ G' Z1 a9 i: J4 `
Sutherland et al13 did not find a correlation between
& d1 v, n1 n0 r& b! k. fchildhood testosterone exposure and reduced adult) y. _" V2 N7 }! m! ~% b$ a9 {
penile length in clinical studies.
: |( `4 |' `- q7 a. z) k$ {Nonetheless, we do not believe our patient is
9 P# z u& n }/ n7 ]" [! S' c2 _going to experience any of the untoward effects from) S3 k: _0 }# s5 U7 ]4 h$ v! D5 H& A
testosterone exposure as mentioned earlier because
0 w6 Y8 l7 @- {8 x- K0 P( |the exposure was not for a prolonged period of time.7 M+ f6 O4 T' \( v6 X
Although the bone age was advanced at the time of2 B3 _. e( v- c3 Z
diagnosis, the child had a normal growth velocity at% p. p) A: J2 d' P, d6 f3 r
the follow-up visit. It is hoped that his final adult
& d- y4 a" H# G9 ?8 xheight will not be affected.3 F$ G4 z) R4 |7 M1 i9 c
Although rarely reported, the widespread avail-+ k2 P& }4 V( {8 o7 j
ability of androgen products in our society may
7 A5 p s2 B" Iindeed cause more virilization in male or female/ T' z* y- j0 [; I; A
children than one would realize. Exposure to andro-8 g0 X$ c# B# }% v3 A
gen products must be considered and specific ques-
# c; D; ^/ H' F p1 ktioning about the use of a testosterone product or
$ D, H& P2 ^+ v: [gel should be asked of the family members during
) H' q; T1 q( Pthe evaluation of any children who present with vir-$ ?3 M8 L( l% }7 N
ilization or peripheral precocious puberty. The diag-
, [6 E4 l! i9 Z v anosis can be established by just a few tests and by+ s8 c1 F' L+ }9 k7 u5 k/ ]
appropriate history. The inability to obtain such a2 x7 D& P |2 Q) Y! M" X' C3 \
history, or failure to ask the specific questions, may0 f/ K5 t, Y7 s& l% `5 o
result in extensive, unnecessary, and expensive1 r* e& r2 [0 C9 ]/ U5 i. {% C
investigation. The primary care physician should be' v5 E& t7 w8 B: [
aware of this fact, because most of these children
* F% C3 W v" J' P- R$ ?& ~ ?. Rmay initially present in their practice. The Physicians’
3 N: d( G" _( E( {Desk Reference and package insert should also put a
! a: ]6 \" `4 {8 ~0 }$ X& u9 owarning about the virilizing effect on a male or Z8 A, X; a8 B! d) G
female child who might come in contact with some-
# h6 Q7 H# l8 `, D* O0 Eone using any of these products.$ |2 F, r7 F7 ?
References
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% }5 _: [- ]& K* u1 X) Dareas: organic central precocious puberty. Acta Paediatr.
$ i& B0 f! _4 n9 n! l2001;90:751-756.
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& @9 r8 w- g8 u7. Klugo RC, Cerny JC. Response of micropenis to topical
0 N7 l! i; l; i2 G! Ltestosterone and gonadotropin. J Urol. 1978;119:% c# ^) R/ _+ b: X& _ s8 p5 P
667-668." q& Q, x5 B0 N- Z/ i ?% S2 D
8. Guthrie RD, Smith DW, Graham CB. Testosterone
5 A/ _8 {) K; }# |treatment for micropenis during early childhood. J Pediatr.) V$ X% r( }) T$ \& v3 @
1973;83:247-252.% Y) Y" F, |, x e" N
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