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is a significant concern for physicians. Central
9 N8 h' m- s) g4 _' mprecocious puberty (CPP), which is mediated9 q/ F$ e9 |% T2 y- y# }
through the hypothalamic pituitary gonadal axis, has+ F& ~5 i) e* l" m& T- a
a higher incidence of organic central nervous system
1 I% v3 S* D) B/ Hlesions in boys.1,2 Virilization in boys, as manifested4 f8 v$ O \& x; b+ w6 }
by enlargement of the penis, development of pubic$ W# K f: @* u" E) j- F0 _
hair, and facial acne without enlargement of testi-4 D1 v5 G; U* k, q9 E2 U
cles, suggests peripheral or pseudopuberty.1-3 We
1 \: \* C) E* w7 nreport a 16-month-old boy who presented with the I& N* V) E. I& o/ e/ d
enlargement of the phallus and pubic hair develop-
) ]5 E6 L( p+ \, l/ d! Gment without testicular enlargement, which was due
" {$ `8 z4 } qto the unintentional exposure to androgen gel used by
4 \: m! D: L+ u' [& Cthe father. The family initially concealed this infor-% M' k' J0 O e) K" I% j$ ] ^, x' F
mation, resulting in an extensive work-up for this# f$ n) ^; J( a* G& l# W
child. Given the widespread and easy availability of1 R3 J" i0 H0 Y7 L# g
testosterone gel and cream, we believe this is proba-( }0 ]- j5 D$ k* L" B4 {" R
bly more common than the rare case report in the3 O/ }* m7 `- m& F( \
literature.4
4 L# J+ x- k6 d, r* hPatient Report
* Y" p0 T' D* g/ Q) {% kA 16-month-old white child was referred to the
; p1 u. A2 I# ^9 y4 q. o4 D% _endocrine clinic by his pediatrician with the concern$ X, _/ E, W& P3 F$ | h
of early sexual development. His mother noticed
- I/ A- q& T, |. \light colored pubic hair development when he was
2 O# V: P1 u* N' m. X0 _" ZFrom the 1Division of Pediatric Endocrinology, 2University of" ]( C) E# S+ y& S8 W" E
South Alabama Medical Center, Mobile, Alabama./ T3 N" @& @" |4 x1 y7 v" l" Z o
Address correspondence to: Samar K. Bhowmick, MD, FACE,8 ]5 I& n6 D) O* A" u! Q; X3 V
Professor of Pediatrics, University of South Alabama, College of5 j) w. F* X9 m# } j( K
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
( I; W4 ~& j% \& J# \& M& [e-mail: [email protected].
+ F, `& \ z& k" o* G8 \" Fabout 6 to 7 months old, which progressively became3 B$ O% T4 e: f: ?
darker. She was also concerned about the enlarge-5 _8 _2 k6 q/ w
ment of his penis and frequent erections. The child! x6 ]$ ?% N) C f& c
was the product of a full-term normal delivery, with
% v" o8 N+ o M7 D# {a birth weight of 7 lb 14 oz, and birth length of
7 Y5 x# X D1 y20 inches. He was breast-fed throughout the first year
9 N5 o$ h8 M) Mof life and was still receiving breast milk along with
; G" k" T7 q6 D' m# a G; }solid food. He had no hospitalizations or surgery,
]- \' Z, q; a6 k+ q9 |and his psychosocial and psychomotor development
! @% s- p6 s ~% L% ]7 bwas age appropriate.
. R' Z1 U+ h+ @2 {" ^2 b) qThe family history was remarkable for the father,$ N8 Q+ ]# F& \
who was diagnosed with hypothyroidism at age 16,8 U' C8 h2 a) v2 V7 ?2 p8 L
which was treated with thyroxine. The father’s
1 i: M/ `) u; @5 U: [6 c# Fheight was 6 feet, and he went through a somewhat3 R2 ~! Z7 `0 c% I; `0 s$ D; c
early puberty and had stopped growing by age 14.
6 p+ t1 [0 @! J' N$ gThe father denied taking any other medication. The
! D" p8 ]" ~! ]5 Schild’s mother was in good health. Her menarche) {0 K; r0 `3 P' N
was at 11 years of age, and her height was at 5 feet
4 @* R S0 a0 @! w( t4 E g5 inches. There was no other family history of pre-
- Q8 |5 N5 t+ v/ e1 A4 X1 ycocious sexual development in the first-degree rela-7 x0 [$ N9 n7 J+ Y6 Z
tives. There were no siblings.
- p i: O" g* ?* f$ Z2 fPhysical Examination
! j6 ~$ u. I4 A. n }The physical examination revealed a very active,
/ s- R" ~, E N3 m6 Tplayful, and healthy boy. The vital signs documented3 S3 `0 ?8 A* W, l- n! F7 R4 @
a blood pressure of 85/50 mm Hg, his length was( [5 `% E* C( G' H
90 cm (>97th percentile), and his weight was 14.4 kg6 C u! I/ A- S7 _
(also >97th percentile). The observed yearly growth* n4 ?! N! z' r; p4 B$ Y9 N
velocity was 30 cm (12 inches). The examination of. }2 W9 b# ]$ r/ Z4 U
the neck revealed no thyroid enlargement.' h2 [* x% p' {2 C/ Q- p; B4 a9 c3 N. p, k- E
The genitourinary examination was remarkable for& D: f# Q7 h# V$ {
enlargement of the penis, with a stretched length of
) I) \4 o1 o5 D' J8 cm and a width of 2 cm. The glans penis was very well
& ~ |5 }! j# d3 ideveloped. The pubic hair was Tanner II, mostly around
" V" Q! m5 G% Z6 g; W5407 a# C0 t8 z( [! @ @% u9 d6 u6 s E6 Q" n
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from" m6 R8 ?4 O. s
the base of the phallus and was dark and curled. The
( j' s% M- @7 ^0 u1 j! Ltesticular volume was prepubertal at 2 mL each.( D; ~8 l- i) [2 m" l8 n) Q
The skin was moist and smooth and somewhat! P" d3 c2 q" m# |; _
oily. No axillary hair was noted. There were no3 W6 r7 ^' j9 a s# a+ m
abnormal skin pigmentations or café-au-lait spots.
8 R# \7 N" n& V6 t' k& qNeurologic evaluation showed deep tendon reflex 2+) d) E# M( ]- `) J
bilateral and symmetrical. There was no suggestion
. Z7 z" y- f& i* b3 b4 oof papilledema./ b' b" S! k3 h. K; z- y. x
Laboratory Evaluation J s" {( g* n( y! d; U1 k
The bone age was consistent with 28 months by
/ d0 {& N3 _. ^) ausing the standard of Greulich and Pyle at a chrono-! r8 ]5 z3 L/ G: n: ?6 B+ g2 A1 U
logic age of 16 months (advanced).5 Chromosomal
$ F @* N$ }8 i @) Q' hkaryotype was 46XY. The thyroid function test4 e& z( v% n& ^
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
8 e% Q @1 M- t0 Y; p7 q' jlating hormone level was 1.3 µIU/mL (both normal).- @4 d1 l! s8 l/ P4 y, L* [- i+ b
The concentrations of serum electrolytes, blood& W. {5 D2 y/ T$ n. |- K
urea nitrogen, creatinine, and calcium all were7 p3 U4 T3 _5 t5 P
within normal range for his age. The concentration
4 p; K8 e: \( qof serum 17-hydroxyprogesterone was 16 ng/dL$ F5 C+ t. T. Z& E8 f
(normal, 3 to 90 ng/dL), androstenedione was 205 [$ I+ E) s4 Z q
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
- C9 i, n4 ^% r+ g; t4 ]7 s6 ?8 gterone was 38 ng/dL (normal, 50 to 760 ng/dL),2 h9 j. a8 R# d3 G7 i$ c# O+ a* r$ j
desoxycorticosterone was 4.3 ng/dL (normal, 7 to5 C+ O& e/ X2 M+ T4 G
49ng/dL), 11-desoxycortisol (specific compound S)8 G' K5 r( |$ J
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
5 B- ^. A- h. s! W& a. ]tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
% g6 k6 I# G0 b: X3 ytestosterone was 60 ng/dL (normal <3 to 10 ng/dL),3 v* m& x; W) y4 J: N$ k
and β-human chorionic gonadotropin was less than u6 g( l! ^: I& u3 }' Q
5 mIU/mL (normal <5 mIU/mL). Serum follicular9 }3 y' h5 h" G" F; h( q5 Z4 ]+ @/ m
stimulating hormone and leuteinizing hormone
* p/ z3 ], I$ z# L! r( j; F2 lconcentrations were less than 0.05 mIU/mL8 B( `+ N: A- u( ^+ e; \0 H
(prepubertal).
M5 f* @2 D( A: z5 A% n( D1 L7 hThe parents were notified about the laboratory
$ ^! K2 ]+ X8 ?5 u8 z6 t- presults and were informed that all of the tests were1 x% z; C% d2 a2 m: M. N
normal except the testosterone level was high. The3 E6 B" t1 D {
follow-up visit was arranged within a few weeks to
9 {6 B( @6 F9 m4 Z- M! Sobtain testicular and abdominal sonograms; how-" f( R. P$ r* ?1 H8 _! W8 u
ever, the family did not return for 4 months.* E+ b- i. ?4 u o0 n: r
Physical examination at this time revealed that the
% I7 _' j$ [+ \; z# bchild had grown 2.5 cm in 4 months and had gained
8 c% k; H6 D8 B' v/ L2 kg of weight. Physical examination remained9 t' ?: [8 i+ i" @; s* l* Q- k$ a
unchanged. Surprisingly, the pubic hair almost com-
( B% G8 G. R" k: v& C3 z% w7 tpletely disappeared except for a few vellous hairs at7 E* q+ Q+ `( s
the base of the phallus. Testicular volume was still 24 K; V1 k% n3 R
mL, and the size of the penis remained unchanged.
% Q3 F5 }4 o' f4 i0 ~- g& `The mother also said that the boy was no longer hav-
! g$ L! {$ L/ }# |; `( }& ?ing frequent erections.
' X- @8 [) Z& j. CBoth parents were again questioned about use of
" F$ |! ^) f- ?& cany ointment/creams that they may have applied to
4 H7 g) V% L) j7 u/ Q1 Bthe child’s skin. This time the father admitted the
: W- b4 ^- P$ x! oTopical Testosterone Exposure / Bhowmick et al 5417 C g) j" `) ]& g0 V
use of testosterone gel twice daily that he was apply-
( P; u) Y7 E+ H1 b+ ^( Uing over his own shoulders, chest, and back area for2 @1 g+ t, g8 }& l7 c# v1 M
a year. The father also revealed he was embarrassed5 @2 I& y y2 g9 o
to disclose that he was using a testosterone gel pre-
: H. t2 \5 w( _scribed by his family physician for decreased libido0 |% I4 {8 h; ^+ `; Z0 P" h! o/ ?: y
secondary to depression.
( R/ u- ~4 G7 p Q+ d b+ O6 }: W( YThe child slept in the same bed with parents.
0 ^8 e( _2 E8 d; XThe father would hug the baby and hold him on his
|8 c1 f0 p kchest for a considerable period of time, causing sig-8 K3 \: C0 F. c7 L& C
nificant bare skin contact between baby and father.! }3 l# y1 J7 |3 Q4 r" s
The father also admitted that after the phone call,' I1 V Z. V) ]5 [" j! J
when he learned the testosterone level in the baby; o/ R# Z% Z& E+ N" U
was high, he then read the product information! R7 u/ Z9 h% g) G
packet and concluded that it was most likely the rea-4 {3 k0 @: d' p% Q
son for the child’s virilization. At that time, they! N% o: U. `% ^& }$ {
decided to put the baby in a separate bed, and the
' a! u2 Q& T1 {- Xfather was not hugging him with bare skin and had0 V+ c( l, @$ i: P& u! P9 i- |5 U
been using protective clothing. A repeat testosterone: [. E: Z3 S# A. J8 M2 M
test was ordered, but the family did not go to the- a" k# K2 G q' {; q, ]
laboratory to obtain the test.
5 a8 [: e; u8 M ^" J. vDiscussion3 `0 O5 Z u3 U/ M# q5 J
Precocious puberty in boys is defined as secondary. e/ L7 u! N2 b! G6 T" A) ~
sexual development before 9 years of age.1,4, Q0 R' |* I* q% k" G
Precocious puberty is termed as central (true) when" b% {2 ]; h) C4 ~
it is caused by the premature activation of hypo-0 L8 v7 y1 x8 ]7 ]
thalamic pituitary gonadal axis. CPP is more com-/ n9 @$ Y( e3 o7 ?6 z5 x2 h, h0 _
mon in girls than in boys.1,3 Most boys with CPP
( w: z/ l+ |$ S! _: I& v kmay have a central nervous system lesion that is
( g$ W# X9 f$ l" L' h% yresponsible for the early activation of the hypothal-
; N2 W8 C# @- S* ?+ O, iamic pituitary gonadal axis.1-3 Thus, greater empha-
$ I! t5 ^' Y7 l; T7 C: Asis has been given to neuroradiologic imaging in
: x6 z, i7 l* u+ \' Lboys with precocious puberty. In addition to viril-: A Z+ |5 _$ K
ization, the clinical hallmark of CPP is the symmet-
4 u8 G( r1 |6 |6 e. p& b2 Irical testicular growth secondary to stimulation by
' d# \, r# ]$ K8 t: q+ @. ]gonadotropins.1,37 I3 f& D) o# x/ S! ~% ]
Gonadotropin-independent peripheral preco-% A2 H2 s d* R/ @" h0 `
cious puberty in boys also results from inappropriate
* a0 {8 y8 Y2 Fandrogenic stimulation from either endogenous or, `) Y; l+ b5 k7 K: J
exogenous sources, nonpituitary gonadotropin stim-
' @9 Q0 F3 Y* n' a; p% tulation, and rare activating mutations.3 Virilizing
+ ?2 E# I) a& ocongenital adrenal hyperplasia producing excessive$ I5 `- W. c# Y, u+ M: d3 M
adrenal androgens is a common cause of precocious
H9 o! _& B" z0 |puberty in boys.3,4- T1 r. |8 f: Y* g; s$ P; E$ W
The most common form of congenital adrenal
5 {" _" L! s( E. ohyperplasia is the 21-hydroxylase enzyme deficiency.$ Z% C' q. \& w1 U" l+ S0 z
The 11-β hydroxylase deficiency may also result in
\! `. \# ~! S3 h3 J$ zexcessive adrenal androgen production, and rarely,
5 c$ t- g) T7 R5 i& U7 Y1 Oan adrenal tumor may also cause adrenal androgen! I5 V. N' Y) Q5 t9 r$ J
excess.1,3) T: \0 G5 W4 F" m( E' D' w" }
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from' r* h+ H. O& F4 Z# b2 _$ O8 _; |% o: I
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
# U3 _- k. H& NA unique entity of male-limited gonadotropin-
1 g( w6 @& X; u+ g8 Y: l- Cindependent precocious puberty, which is also known7 D! }+ M5 Z B1 `, W7 u3 e
as testotoxicosis, may cause precocious puberty at a
% J4 I7 j9 ?# \! Qvery young age. The physical findings in these boys$ V7 w3 m% ?+ F5 W/ j
with this disorder are full pubertal development,# F D7 o- I/ b9 m# y' z% _
including bilateral testicular growth, similar to boys, |- ?) d) S. @, Z2 h$ O5 d
with CPP. The gonadotropin levels in this disorder& D* T, ]! L! K6 n# _7 U) o2 M3 H+ W
are suppressed to prepubertal levels and do not show2 i; k( d- F, P- I5 ?* q) S# k
pubertal response of gonadotropin after gonadotropin-
9 w/ Z' w2 B/ K! s T6 ]) M preleasing hormone stimulation. This is a sex-linked7 G& [. j7 @# r3 D7 Q
autosomal dominant disorder that affects only
) ?+ c6 k3 q! H. G+ Q! F# Omales; therefore, other male members of the family
# H$ a e- I" }) I; {4 R- ]& Emay have similar precocious puberty.34 k' ?$ [' K: T: m8 j' Y0 O7 e, G
In our patient, physical examination was incon-3 P5 g1 m1 B* a5 }1 J3 F
sistent with true precocious puberty since his testi-* o5 |% G" R# n) s
cles were prepubertal in size. However, testotoxicosis3 C) R U8 U! t, \' \/ C# D3 ]
was in the differential diagnosis because his father
, s) E, h' v5 l+ K$ [( tstarted puberty somewhat early, and occasionally,% I/ c! L9 `, e# `8 @' H3 I" f+ p
testicular enlargement is not that evident in the
% P( p3 R1 u3 a |( F- Z) Rbeginning of this process.1 In the absence of a neg-1 M8 X( O7 K& v4 A/ [8 D
ative initial history of androgen exposure, our: D8 {- f4 G. o! A
biggest concern was virilizing adrenal hyperplasia,
$ c4 N r/ K {! m& c* _& S6 [either 21-hydroxylase deficiency or 11-β hydroxylase: ]9 P, v$ Y F' C2 ?9 |2 j6 H9 q. j
deficiency. Those diagnoses were excluded by find-* O. o2 x+ P- [# Q. W! P0 @
ing the normal level of adrenal steroids. b0 {; N7 H6 v: A0 c
The diagnosis of exogenous androgens was strongly, l! g+ S6 G6 x3 D6 t$ H
suspected in a follow-up visit after 4 months because
. Q: Z! \& B1 U* A9 ~* Uthe physical examination revealed the complete disap-
4 a; Q/ r) ?) \+ ^pearance of pubic hair, normal growth velocity, and
0 {- s+ g+ s/ ~; Hdecreased erections. The father admitted using a testos-8 Y& e8 P7 s$ ^, U
terone gel, which he concealed at first visit. He was
0 r9 ^+ X" ?0 Y9 t& Yusing it rather frequently, twice a day. The Physicians’
( ~! m5 v5 ^" M- c" NDesk Reference, or package insert of this product, gel or. ^8 q* `& `. o9 s) z7 h
cream, cautions about dermal testosterone transfer to( X' t# {0 L* m
unprotected females through direct skin exposure.
: h5 K; U- J$ ~- ESerum testosterone level was found to be 2 times the, ]' T9 S2 |2 B& {7 C6 O
baseline value in those females who were exposed to
; {2 [ ~3 ]1 [- r s, J: {8 Jeven 15 minutes of direct skin contact with their male
5 Q, M2 E/ d& f4 X5 V4 Kpartners.6 However, when a shirt covered the applica-
+ Q4 V2 f/ s% P+ U- i) K1 n0 ution site, this testosterone transfer was prevented.
) X9 w, Z) G! vOur patient’s testosterone level was 60 ng/mL,
- r$ V+ q) w! Ywhich was clearly high. Some studies suggest that0 f/ f$ v* K% D! i& ?
dermal conversion of testosterone to dihydrotestos-
; K/ O" C4 T# E% O$ lterone, which is a more potent metabolite, is more9 q) P/ d$ [6 R1 L; a- D
active in young children exposed to testosterone
+ i7 Q9 k7 s* u6 |exogenously7; however, we did not measure a dihy-
$ _/ b+ ^% p0 v# }/ ^: s$ ?; Hdrotestosterone level in our patient. In addition to
; g) ]. C+ A/ g/ Dvirilization, exposure to exogenous testosterone in# A- u" Z# ]' o
children results in an increase in growth velocity and
( a1 O2 a) t s" b$ F2 {advanced bone age, as seen in our patient.
$ H4 M& \, x- b6 W/ m/ L& N9 VThe long-term effect of androgen exposure during/ d2 Z' Q+ ^, U2 q q0 Z
early childhood on pubertal development and final" q' F0 I& y: q8 r
adult height are not fully known and always remain
% e! F; K4 }' e6 U ?: Ka concern. Children treated with short-term testos-
" E* S+ ^$ B( P7 m9 @) \( tterone injection or topical androgen may exhibit some
x8 W3 b. [6 Cacceleration of the skeletal maturation; however, after. M1 A0 K' I; B6 O
cessation of treatment, the rate of bone maturation$ I! g1 m* g+ a- j3 a3 W; C8 p
decelerates and gradually returns to normal.8,9
7 A* X9 @( l1 e; b: A( ?* rThere are conflicting reports and controversy1 l. m1 t. i; Y1 l3 m
over the effect of early androgen exposure on adult. d+ a9 L; c" b3 o" ~
penile length.10,11 Some reports suggest subnormal9 `$ x6 @% U+ |+ M0 }
adult penile length, apparently because of downreg-
7 x6 w3 g: d7 p" Oulation of androgen receptor number.10,12 However,
" @3 f4 n$ ~* Z u, U1 k5 nSutherland et al13 did not find a correlation between( ^5 b5 O8 o, z# w( `+ `
childhood testosterone exposure and reduced adult
. j) W6 f+ v% ^& L, Epenile length in clinical studies.
9 N" k* t* }5 f7 j6 BNonetheless, we do not believe our patient is* M* B/ R: r* ?( t
going to experience any of the untoward effects from! p% V" P: i% v% R/ i
testosterone exposure as mentioned earlier because5 ], {0 W8 z0 g: [* [1 F
the exposure was not for a prolonged period of time.- m4 z5 [" w4 }+ p$ J3 t6 u! k
Although the bone age was advanced at the time of2 T6 p2 G" Z7 [5 y' @; U8 K
diagnosis, the child had a normal growth velocity at
2 r( R# R) ^+ K% m6 r5 vthe follow-up visit. It is hoped that his final adult- M$ ]% O# z9 \ s% N
height will not be affected./ U! _8 J$ i) F
Although rarely reported, the widespread avail-* i+ R+ k2 G3 J9 K, S d
ability of androgen products in our society may# O) ]; v' b: ^
indeed cause more virilization in male or female
+ Q. l% X2 @& lchildren than one would realize. Exposure to andro-. c9 M5 c7 B Y. H7 A% J
gen products must be considered and specific ques-
6 R$ A+ H# {) \; p; S- i: C% Ctioning about the use of a testosterone product or y$ K0 C$ z' R( I% f
gel should be asked of the family members during
7 m, X% U) N4 tthe evaluation of any children who present with vir-
7 B y; x7 Q5 N. K3 z3 a6 oilization or peripheral precocious puberty. The diag-
; J0 ]# @# u. lnosis can be established by just a few tests and by
; D) x4 X$ R2 N, G+ F" E( Q' j# _appropriate history. The inability to obtain such a
' J: ?. |8 c7 e4 z5 ^7 uhistory, or failure to ask the specific questions, may
& ]2 S9 ]3 f" U. ^% Y* tresult in extensive, unnecessary, and expensive
- y. g! g: o+ Y/ c$ t/ M% kinvestigation. The primary care physician should be; b6 E1 p5 j, v: n2 ?' o2 n
aware of this fact, because most of these children$ ?& q; G% ?, V+ X
may initially present in their practice. The Physicians’5 x* z* K" j- I' G) r$ ^* n8 L
Desk Reference and package insert should also put a
) e1 }# p0 n# T( Twarning about the virilizing effect on a male or2 Z7 f" x8 h( C. I
female child who might come in contact with some-
; f3 }2 r! B& F {+ a/ w" mone using any of these products./ b0 _8 V: ^) A9 K; S" Y6 N+ G
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2 w* D9 Q6 `. ^2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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