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is a significant concern for physicians. Central
- V; B, b# c. t) b/ y" E' m _precocious puberty (CPP), which is mediated3 c6 v$ x. c. v
through the hypothalamic pituitary gonadal axis, has
7 p' t4 z6 v3 n% H, h6 ~a higher incidence of organic central nervous system# \4 I5 y+ ]/ q4 R9 k4 W% c' I
lesions in boys.1,2 Virilization in boys, as manifested
9 T. N% L" k6 z2 x4 j6 {9 [; o5 `4 bby enlargement of the penis, development of pubic
$ x/ Z% F! A1 qhair, and facial acne without enlargement of testi-1 N. r. y0 C! }; T* b2 m5 R8 W
cles, suggests peripheral or pseudopuberty.1-3 We
8 }; ?9 @7 Y i1 @7 Ireport a 16-month-old boy who presented with the; B& P6 U. k* L. t J( k/ ?
enlargement of the phallus and pubic hair develop-
% e1 R5 j1 h0 ^: ^' ~ment without testicular enlargement, which was due/ d. u7 C, B% n0 m
to the unintentional exposure to androgen gel used by* M- D1 p: [5 T2 W
the father. The family initially concealed this infor-
/ n( L) I t8 r, y3 C. u* Q' qmation, resulting in an extensive work-up for this3 I5 ~ I1 \ e* I
child. Given the widespread and easy availability of3 z2 p' U7 @3 v0 H! L$ D' }5 G! Z4 Q
testosterone gel and cream, we believe this is proba-
" u/ _& d R9 Zbly more common than the rare case report in the
" ~1 h, _ _ xliterature.40 X8 b! g4 ~. G7 A2 V
Patient Report
6 t' j! t; C7 ]. YA 16-month-old white child was referred to the! q0 a, ^$ ?3 T0 D
endocrine clinic by his pediatrician with the concern- m. ?, Y1 y5 F, z7 E& H
of early sexual development. His mother noticed
& `; a0 B# ~% | `( h. l& q/ |light colored pubic hair development when he was, V& R8 d- c* O4 d& p2 [- I
From the 1Division of Pediatric Endocrinology, 2University of
6 q1 y, g4 d$ X. rSouth Alabama Medical Center, Mobile, Alabama." E/ P$ ~9 P" R5 i" Z
Address correspondence to: Samar K. Bhowmick, MD, FACE,
o" a. o P+ d, QProfessor of Pediatrics, University of South Alabama, College of2 T8 }7 }- l( L2 ` {
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;2 n0 Y \( j( p$ L" d
e-mail: [email protected].
& i( J) C. t& {" i# ^' g9 X) Sabout 6 to 7 months old, which progressively became
8 Y9 Z. V2 d! A# w( xdarker. She was also concerned about the enlarge-
0 e' v3 @) x9 }- _ment of his penis and frequent erections. The child
5 E( W4 k7 e0 w" W, E$ g& Q; T9 U( @( ~was the product of a full-term normal delivery, with
3 T" ~* ~" f" _/ h o7 aa birth weight of 7 lb 14 oz, and birth length of
8 D, |, L" D/ j# h- P20 inches. He was breast-fed throughout the first year4 [* U W# l' W# V' F0 M
of life and was still receiving breast milk along with( H+ w: m3 i& t
solid food. He had no hospitalizations or surgery,
; P s* Q+ E) {$ L" k& ^9 P5 l* @! Nand his psychosocial and psychomotor development0 a8 M) m- V1 c+ a9 Y$ E
was age appropriate.
. B: @4 p+ [( W# y& J2 mThe family history was remarkable for the father,) W9 l; w+ ?. O X. `
who was diagnosed with hypothyroidism at age 16,: \& C L: m/ H6 [, d4 `
which was treated with thyroxine. The father’s
1 ~) ^: m G. S3 n7 Q2 c4 e2 T* ^height was 6 feet, and he went through a somewhat( W! }& a3 S. ]4 c' \, g7 _
early puberty and had stopped growing by age 14.
- d- W2 k. c t4 g) g! H0 IThe father denied taking any other medication. The
1 R8 `9 S9 D4 [9 u* L8 Y7 nchild’s mother was in good health. Her menarche
& ^/ O) @7 t& Z# ~3 Dwas at 11 years of age, and her height was at 5 feet
" z. u/ I7 k' n& W( j% R$ Z0 f3 a5 inches. There was no other family history of pre-2 f; O9 t1 b% Y2 H# {- m
cocious sexual development in the first-degree rela-
; _+ `$ i" B+ p5 n9 j* b( T( [tives. There were no siblings.6 q/ {) F7 h( @
Physical Examination, T1 c* s3 k' b9 u2 l+ j' f: L
The physical examination revealed a very active,3 Y: `2 l8 @3 D& A+ ^
playful, and healthy boy. The vital signs documented
9 C8 ^4 D! G- {a blood pressure of 85/50 mm Hg, his length was% A' _7 `% q- E2 a b3 Z
90 cm (>97th percentile), and his weight was 14.4 kg& X. `, w# h6 P6 q
(also >97th percentile). The observed yearly growth
7 B0 I& D" P+ D5 j% d. r# Rvelocity was 30 cm (12 inches). The examination of5 ~, _+ v$ I& k0 |
the neck revealed no thyroid enlargement.. \& O5 X; m, P
The genitourinary examination was remarkable for
* z5 T! t; u( U' ~enlargement of the penis, with a stretched length of9 H. B4 |- O H/ r1 m2 Z( q7 L
8 cm and a width of 2 cm. The glans penis was very well
3 ~% s4 l l# v1 d" Zdeveloped. The pubic hair was Tanner II, mostly around) T$ X) m: G: J2 p
540& g2 K0 v7 A. Z5 Q) m
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the base of the phallus and was dark and curled. The/ N P, _' _: z! b
testicular volume was prepubertal at 2 mL each.
9 d6 y' L$ G1 {The skin was moist and smooth and somewhat5 u& M a. B+ H' R4 v- y& ]0 s
oily. No axillary hair was noted. There were no! U& \7 {( f. r X
abnormal skin pigmentations or café-au-lait spots.: ^% k, U3 z$ I1 S
Neurologic evaluation showed deep tendon reflex 2+* \& _! p3 F2 {5 p) r# w8 ^
bilateral and symmetrical. There was no suggestion6 y7 c8 S& A2 C/ Z' H4 D
of papilledema.. {7 m. Y; f, ^* I$ V
Laboratory Evaluation
3 n( C& H) o! o& U& dThe bone age was consistent with 28 months by
, S0 }8 o, ]: ^7 A; U0 V7 h: i+ qusing the standard of Greulich and Pyle at a chrono-
- N2 m" A: ^; Q7 c1 c( klogic age of 16 months (advanced).5 Chromosomal- V8 P/ J4 `$ {" h
karyotype was 46XY. The thyroid function test( a( X: W0 w; C! H
showed a free T4 of 1.69 ng/dL, and thyroid stimu-$ }# _: D- Q9 y0 }
lating hormone level was 1.3 µIU/mL (both normal).
' v7 `# L% E) I- t H4 I: W2 a0 s" oThe concentrations of serum electrolytes, blood
( o$ Z d: C+ y& ]urea nitrogen, creatinine, and calcium all were
7 n H. i: `6 {% ]/ Qwithin normal range for his age. The concentration
' P) N+ {1 I6 y' Lof serum 17-hydroxyprogesterone was 16 ng/dL: u) z: u" |/ z5 ~( A) y
(normal, 3 to 90 ng/dL), androstenedione was 20
7 P$ a: m' Z2 dng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-4 v" s/ R* R9 P4 j0 |7 s+ `
terone was 38 ng/dL (normal, 50 to 760 ng/dL),; t5 v* T( T. N7 N
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
2 l0 l6 w7 q1 a/ j! j( g49ng/dL), 11-desoxycortisol (specific compound S)
8 Z0 ]7 c! B7 Q; R- ?was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-/ z5 w* g# C9 n: s6 f) r
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
; ~% i' Y, C+ \# o+ Q3 Ztestosterone was 60 ng/dL (normal <3 to 10 ng/dL),2 r& G1 R b% C7 b0 n# G& `# _/ C
and β-human chorionic gonadotropin was less than
7 m H$ i/ F8 t0 F5 s5 mIU/mL (normal <5 mIU/mL). Serum follicular9 `5 E; t. C. t+ ^; W, [1 X
stimulating hormone and leuteinizing hormone' ?( K. d# w3 Q J
concentrations were less than 0.05 mIU/mL
2 F' W$ k, p- ^: _. W(prepubertal).
4 Z/ ]9 X# l. g4 ^, `- w1 d! Y3 wThe parents were notified about the laboratory
+ B- p I: i yresults and were informed that all of the tests were/ {& D- C/ U3 Y) M9 I+ X7 O. b
normal except the testosterone level was high. The
& J( g0 N3 D2 O6 r; K- K- |follow-up visit was arranged within a few weeks to
/ q7 N5 i( k; Z* k, W! R! nobtain testicular and abdominal sonograms; how-
- L0 t" ?# v8 P- uever, the family did not return for 4 months.
8 I4 A7 [+ n/ tPhysical examination at this time revealed that the% F: T. u* _$ {9 X
child had grown 2.5 cm in 4 months and had gained6 u; W8 t9 C9 k, ]' w# c g
2 kg of weight. Physical examination remained
+ ]$ l2 K: o7 ?2 j7 Nunchanged. Surprisingly, the pubic hair almost com-
9 t; M% B: x& A3 |) W8 Z" qpletely disappeared except for a few vellous hairs at& m8 z, z) A8 ^1 V* K6 Y0 V
the base of the phallus. Testicular volume was still 28 T9 ]! K5 g* \5 k( o) M) R
mL, and the size of the penis remained unchanged.+ |6 a( J; w, ` v
The mother also said that the boy was no longer hav-' Y' Y8 C) G f* x& g! F2 K
ing frequent erections.; ]+ E4 K% y% y8 b( Y
Both parents were again questioned about use of
# Z3 x( u* C3 ~, U7 eany ointment/creams that they may have applied to" y4 m8 g/ }) o, T3 {
the child’s skin. This time the father admitted the
1 M- s- d6 |! Z: L0 M3 f$ w) tTopical Testosterone Exposure / Bhowmick et al 541
; E, F* p1 ]0 R; u; u. N: Puse of testosterone gel twice daily that he was apply-
1 {3 y% x: w$ Uing over his own shoulders, chest, and back area for
A$ [# C7 d Ha year. The father also revealed he was embarrassed
1 K( E# p. Y+ B$ s6 Tto disclose that he was using a testosterone gel pre-
+ y$ R& r9 J) q* g% N. s/ D, pscribed by his family physician for decreased libido% V* ^% E$ Q5 x% b6 J5 c1 R
secondary to depression.( c* ^5 x) c% P2 V7 g9 e+ V% g
The child slept in the same bed with parents.
- i* x+ ^( {- J1 R+ T5 a! B0 sThe father would hug the baby and hold him on his" i* \; R$ A- g+ L
chest for a considerable period of time, causing sig-
& S: N& z7 V- ]: Znificant bare skin contact between baby and father.+ [7 I6 u! K6 A4 M0 h
The father also admitted that after the phone call,
: K+ ^' F% H. K+ ]# }: Zwhen he learned the testosterone level in the baby, j, j4 [. E2 ~6 `8 h
was high, he then read the product information
4 |0 p6 H. |% p4 o( m" Epacket and concluded that it was most likely the rea-4 |5 h0 o/ _2 D/ S! I% S
son for the child’s virilization. At that time, they3 D1 U6 s4 N: e( T, i
decided to put the baby in a separate bed, and the$ }7 _9 f* p( K1 b$ ]+ y2 x6 c
father was not hugging him with bare skin and had* ]8 x3 ?/ s2 W0 U1 M: z1 ?9 }
been using protective clothing. A repeat testosterone1 n E- s" g6 f1 x* z8 A
test was ordered, but the family did not go to the3 a; x) q/ \9 Z! F
laboratory to obtain the test.
1 Q0 q) `- { J2 |: n- xDiscussion
7 m3 b( c2 S4 ^7 X" bPrecocious puberty in boys is defined as secondary
! K6 I$ n) A& ~! Psexual development before 9 years of age.1,4
) \- D+ a O. m+ Z) t" b& Z& uPrecocious puberty is termed as central (true) when
! y! Y5 \" `5 {it is caused by the premature activation of hypo-9 T: e9 g6 s' g) U7 P
thalamic pituitary gonadal axis. CPP is more com-$ x! ^" U F7 o2 x* S2 y$ j8 N
mon in girls than in boys.1,3 Most boys with CPP
: ]8 l2 M" Q6 y, r2 Hmay have a central nervous system lesion that is
! o! S# f5 f- {- D+ fresponsible for the early activation of the hypothal-3 J& I+ _; o1 h# R% ~
amic pituitary gonadal axis.1-3 Thus, greater empha-2 W% H9 ?) Y3 s0 b8 n, t3 o7 k! I* k" L
sis has been given to neuroradiologic imaging in
7 O) z( o8 \9 N/ m( B6 r' Hboys with precocious puberty. In addition to viril-; y; J+ D) t; _6 z2 ^
ization, the clinical hallmark of CPP is the symmet-
* t7 J" y+ o8 x% x( a' Z! |rical testicular growth secondary to stimulation by/ F- u+ C# p8 k b3 v
gonadotropins.1,3- {) V/ e* Q" E1 s9 Y4 `: ?; x
Gonadotropin-independent peripheral preco-
9 p) v: x' g H% q2 ]. hcious puberty in boys also results from inappropriate
/ ?1 v6 r+ d2 i# W7 z" {8 t' o9 z( G/ Zandrogenic stimulation from either endogenous or0 b9 u2 G j& U2 o
exogenous sources, nonpituitary gonadotropin stim-
: c3 ^; F2 R# W# s: tulation, and rare activating mutations.3 Virilizing: T" }. t* N9 z$ i
congenital adrenal hyperplasia producing excessive
0 P( ~, I+ `( Z1 R4 E9 Q) fadrenal androgens is a common cause of precocious# i; |; f3 X8 i# j9 x c, [* E
puberty in boys.3,4
+ j* e% a# @; O1 U3 [2 I* gThe most common form of congenital adrenal
% O1 S6 o" M3 s2 z& l k$ V9 Phyperplasia is the 21-hydroxylase enzyme deficiency.
5 P. ~) V# p l0 TThe 11-β hydroxylase deficiency may also result in# ?: J. @4 f1 a$ Z( N" Z( U, c
excessive adrenal androgen production, and rarely,
& K+ n g C" L: W1 u San adrenal tumor may also cause adrenal androgen* v( ] h# y+ W; K0 O* q6 j3 r$ Z
excess.1,34 ^. @! ^+ U0 p" d8 @' U& b
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from- U/ G) t( _) d& c9 R+ v4 W$ p# _& s9 E
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
5 H) w5 r6 d# _/ z) {A unique entity of male-limited gonadotropin-1 [# u! R/ J0 G. d8 {
independent precocious puberty, which is also known
5 ]" g: Y, D* F. m% N w; \as testotoxicosis, may cause precocious puberty at a
6 T5 c/ J% Y2 L) Y$ b6 h! overy young age. The physical findings in these boys
6 |$ `( g8 n" X+ N2 [0 j, i2 pwith this disorder are full pubertal development,
' W' V; B/ N5 h( kincluding bilateral testicular growth, similar to boys# ?% j4 D: A( P; F8 F( h8 f( H
with CPP. The gonadotropin levels in this disorder
) a- f3 y$ ]9 _ y q4 {& X- rare suppressed to prepubertal levels and do not show5 }( s( b+ i3 g5 }
pubertal response of gonadotropin after gonadotropin-
' K m: q8 ~8 z/ @releasing hormone stimulation. This is a sex-linked, B; x3 U5 `7 p- [1 b6 i
autosomal dominant disorder that affects only
" o+ _( h0 D7 r: M% {males; therefore, other male members of the family
7 m4 @; m* d+ {, j) ]* \ ymay have similar precocious puberty.3
3 `+ ~6 h9 f$ K! x% @In our patient, physical examination was incon-( P8 d# O# |2 [
sistent with true precocious puberty since his testi-+ S7 O( o- @2 Y. i3 O/ `
cles were prepubertal in size. However, testotoxicosis% Z, ?0 \' V9 @( B- a ~
was in the differential diagnosis because his father2 K4 v) G2 E" @* O2 m
started puberty somewhat early, and occasionally,, s% o8 y1 c" ?$ x
testicular enlargement is not that evident in the
# d4 S, T$ V; |" o+ t) p, q% Z7 Obeginning of this process.1 In the absence of a neg-
; B+ I4 K; l1 K, Z$ k" Hative initial history of androgen exposure, our, e& ~ {' }+ O4 Y
biggest concern was virilizing adrenal hyperplasia,! d9 n% p: N ~
either 21-hydroxylase deficiency or 11-β hydroxylase
% ~1 Z* V @ r+ }, C$ |deficiency. Those diagnoses were excluded by find-( N3 C7 E& U! J3 |- m
ing the normal level of adrenal steroids.- z/ I! L1 |2 c) H! o' x
The diagnosis of exogenous androgens was strongly( r4 \) }4 x/ r
suspected in a follow-up visit after 4 months because
; I0 `( p+ |# h( J- |the physical examination revealed the complete disap-
, K' }1 l' e$ @& }pearance of pubic hair, normal growth velocity, and
$ z7 H! h! v! y4 @( |; {% Idecreased erections. The father admitted using a testos-
+ ]/ q/ Y b3 [) aterone gel, which he concealed at first visit. He was
) c6 `( ~2 T) I. @, n8 fusing it rather frequently, twice a day. The Physicians’
$ p$ k& U$ y' m% {8 ZDesk Reference, or package insert of this product, gel or/ m, Q5 P4 X. x- w1 y" ?3 {
cream, cautions about dermal testosterone transfer to: z, v7 l, |8 M9 F, f
unprotected females through direct skin exposure.+ J2 Y; @* ]: m0 \" U
Serum testosterone level was found to be 2 times the( T, f- ?0 q1 }6 P0 s
baseline value in those females who were exposed to- r3 O$ g/ X& Q( A$ e
even 15 minutes of direct skin contact with their male
: C3 x( n$ z8 J9 V( npartners.6 However, when a shirt covered the applica-
+ T7 E% \, ^, i _, S! Htion site, this testosterone transfer was prevented., Q3 u* [$ t M
Our patient’s testosterone level was 60 ng/mL,. e8 W. e7 f$ J+ q {3 {; o& C
which was clearly high. Some studies suggest that
- f! D; Q0 V6 e+ V- u6 r& { ~' qdermal conversion of testosterone to dihydrotestos-; s9 l7 K5 m. f" f1 V( g
terone, which is a more potent metabolite, is more' q- C4 I' G% l9 V
active in young children exposed to testosterone: U8 t. F! n! g
exogenously7; however, we did not measure a dihy-
% i$ ]% }, h9 q% ydrotestosterone level in our patient. In addition to/ j8 e9 r& z& `+ y9 k
virilization, exposure to exogenous testosterone in
0 P6 k% I' J7 F l5 a* vchildren results in an increase in growth velocity and
* n) L8 p0 W0 uadvanced bone age, as seen in our patient.
0 w& Z: E3 S9 l! Y+ V# f. U+ vThe long-term effect of androgen exposure during# ^, \" p$ A* ?
early childhood on pubertal development and final/ o" K/ s) I( Y. U
adult height are not fully known and always remain
! K; z0 \; N2 o- B+ M- j7 y# @a concern. Children treated with short-term testos-- g" v) n4 D0 ^; {
terone injection or topical androgen may exhibit some$ a+ }% r( ~" L2 |$ i- s
acceleration of the skeletal maturation; however, after
4 T4 M9 n& V5 D7 L6 \cessation of treatment, the rate of bone maturation9 e. R/ `: `' x/ v- O
decelerates and gradually returns to normal.8,9
& z5 w2 m/ K1 A6 a" hThere are conflicting reports and controversy( }, T1 M5 q4 Q. \( ?2 C/ p1 M9 j
over the effect of early androgen exposure on adult
8 v; n7 ]; W& n! T: Y' wpenile length.10,11 Some reports suggest subnormal
* I4 q, d6 z/ H% H3 K8 Y! v9 C1 ]* fadult penile length, apparently because of downreg-4 E4 \9 r0 g1 R3 v. w4 z+ @
ulation of androgen receptor number.10,12 However,
3 |8 r4 c, Z& {# K# a9 ^! D6 _Sutherland et al13 did not find a correlation between: a) J: h1 \8 I: V& X6 H6 J) R
childhood testosterone exposure and reduced adult& T" b( @, y) V8 L' a: [4 G9 f
penile length in clinical studies.
* T, Z* H7 L+ jNonetheless, we do not believe our patient is
8 b. h4 a3 D% [. E; l( Egoing to experience any of the untoward effects from
3 h# u7 U: ~* _& D8 n" Z5 Btestosterone exposure as mentioned earlier because8 l! \. |' e. m
the exposure was not for a prolonged period of time.3 C0 H* x2 M+ O; N7 X* o6 P) M
Although the bone age was advanced at the time of! e' q. O* o' f- \* F
diagnosis, the child had a normal growth velocity at
) p: C" Z4 e3 B. Y% Qthe follow-up visit. It is hoped that his final adult
C+ g' P& j$ wheight will not be affected.; b; ]; e: O6 _, t# n2 W
Although rarely reported, the widespread avail-
& w: n) j' r i* r+ |2 Yability of androgen products in our society may7 y/ b! J# u! V/ o
indeed cause more virilization in male or female
* u0 Z1 B5 r. h Q8 {; ]+ y2 Qchildren than one would realize. Exposure to andro-
. I% s3 i9 W' ]/ a' d( {gen products must be considered and specific ques-
" ]7 E. r! |* Q: m/ j* dtioning about the use of a testosterone product or
' ^7 t" J: `2 y" j& ]+ `7 Kgel should be asked of the family members during
/ u* S' V, ?# v/ j% `the evaluation of any children who present with vir- H& J+ A9 L- X" Y& V
ilization or peripheral precocious puberty. The diag-5 m- @/ ~3 n3 Y8 r4 z9 N& s& a
nosis can be established by just a few tests and by
! V9 n& e6 [ e5 ~9 o0 f- m. Xappropriate history. The inability to obtain such a( S# j0 ^: U5 d8 d3 E
history, or failure to ask the specific questions, may7 \0 r7 e) M! x, L/ _) L: g$ l1 U
result in extensive, unnecessary, and expensive
, [' b, [- z3 Ainvestigation. The primary care physician should be0 I v) P/ d; v) K1 ~- u
aware of this fact, because most of these children
7 D5 ?! c( s) nmay initially present in their practice. The Physicians’
" d- N5 }* `& Q! ?Desk Reference and package insert should also put a
( ], w, ?1 L- ?( V5 b ^4 y. R) j( Rwarning about the virilizing effect on a male or. ^. l) B% W" z3 D5 w& c
female child who might come in contact with some-" h( p5 g3 f. G& H8 I* |' \- [
one using any of these products." z3 y+ Y- @2 f+ h5 V
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' h2 S& d q; H* o/ ?8 C* ]1. Styne DM. The testes: disorder of sexual differentiation
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0 N2 J& M* K. g* b0 U5 p% s7. Klugo RC, Cerny JC. Response of micropenis to topical( M$ n) o: o% m
testosterone and gonadotropin. J Urol. 1978;119:$ i3 T: y5 Q, \" D
667-668.. ~" a- G; Z( A% _
8. Guthrie RD, Smith DW, Graham CB. Testosterone
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